<template>
  <div>
    <!-- 面包屑导航区域！可以分装成为一个组件 -->
    <el-breadcrumb separator="/">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>权限管理</el-breadcrumb-item>
      <el-breadcrumb-item>角色列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 添加角色按钮区域 -->
      <el-row>
        <el-col type="primary">添加角色</el-col>
      </el-row>
      <!-- 角色列表区域 -->
      <el-table :data="roleList"
                border
                stripe>
        <!-- 展开列 -->
        <el-table-column type="expand">
          <!-- 作用域插槽的概念和使用 -->
          <template slot-scope="scope">
            <!-- 使用栅格系统渲染数据 -->
            <el-row :class="['bdbottom',i1===0?'bdtop':'','valign-center']"
                    v-for="(item1,i1) in scope.row.children"
                    :key="item1.id">
              <!-- 渲染一级权限 -->
              <el-col :span="5">
                <el-tag closable
                        @close="removeRightById(scope.row,item1.id)">{{item1.authName}}</el-tag>
                <i class="el-icon-caret-right"></i>
              </el-col>
              <!-- 渲染二级和三级权限 -->
              <el-col :span="19">
                <!-- 通过for循环嵌套渲染二级权限 -->
                <el-row :class="[i2==0?'':'bdtop','valign-center']"
                        v-for="(item2,i2) in item1.children"
                        :key="item2.id">
                  <el-col :span="6">
                    <el-tag type="success"
                            closable
                            @close="removeRightById(scope.row,item2.id)">
                      {{item2.authName}}
                    </el-tag>
                    <i class="el-icon-caret-right"></i>
                  </el-col>
                  <el-col :span="18">
                    <!-- 通过for循环嵌套渲染三级权限 -->
                    <el-tag type="warning"
                            v-for="(item3) in item2.children"
                            :key="item3.id"
                            closable
                            @close="removeRightById(scope.row,item3.id)">
                      {{item3.authName}}
                    </el-tag>
                  </el-col>
                </el-row>
              </el-col>
            </el-row>
            <!-- <pre>
              {{scope.row}}
            </pre> -->
          </template>
        </el-table-column>
        <!-- 索引列 -->
        <el-table-column type="index"></el-table-column>
        <el-table-column lable="角色名称"
                         prop="roleName"></el-table-column>
        <el-table-column lable="角色描述"
                         prop="roleDesc"></el-table-column>
        <el-table-column lable="操作"
                         width="300px">
          <template slot-scope="scope">
            <el-button size="mini"
                       type="primary"
                       icon="el-icon-edit">编辑</el-button>
            <el-button size="mini"
                       type="danger"
                       icon="el-icon-delete">删除</el-button>
            <el-button size="mini"
                       type="warning"
                       icon="el-icon-setting"
                       @click="showSetRightDialog(scope.row)">分配权限</el-button>
          </template>
        </el-table-column>
      </el-table>
    </el-card>
    <!-- 分配权限的对话框 -->
    <el-dialog title="分配权限"
               :visible.sync="setRightDialogVisiable"
               width="30%"
               @close="setRightDialogClosed">
      <!-- 树形控件 -->
      <el-tree :data="rightsList"
               :props="treeProps"
               show-checkbox
               node-key="id"
               :default-checked-keys="defKeys"
               default-expand-all
               ref="treeRef"></el-tree>
      <!-- show-checkbox显示选取框
           props设置分支对象属性
           node-key指定选取的唯一属性
           default-expand-all是否默认展开所有节点
           default-checked-keys默认展开的节点的key的数组
      -->
      <span slot="footer"
            class="dialog-footer">
        <el-button @click="setRightDialogVisiable = false">取 消</el-button>
        <el-button type="primary"
                   @click="allotRights">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data () {
    return {
      // 获取角色列表数据
      roleList: [],
      // 控制分配权限对话框的显示与隐藏
      setRightDialogVisiable: false,
      // 所有权限数据
      rightsList: [],
      // 树形控件的属性绑定对象
      treeProps: {
        children: 'children', // 实现父子嵌套用的属性
        label: 'authName' // 显示的文本字段
      },
      // 默认选取的节点id值数组
      defKeys: [],
      // 当前设置权限角色id
      roleId: ''
    };
  },
  created () {
    this.getRolesList()
  },
  methods: {
    // 获取角色列表
    async getRolesList () {
      const { data: result } = await this.$http.get('roles')
      if (result.meta.status !== 200) return this.$message.error('获取角色列表失败')
      this.roleList = result.data
      // console.log(this.roleList);
    },
    // 根据id删除对应的权限
    async removeRightById (role, rightId) {
      // 弹框提示用户是否要删除
      const confirmResult = await this.$confirm(
        '是否删除此用户的该项权限？',
        '提示',
        {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }
      ).catch(err => err)
      if (confirmResult !== 'confirm') return this.$message.info('结束删除')

      // 发起删除请求
      const { data: result } = await this.$http.delete(
        `roles/${role.id}/rights/${rightId}`
      )
      if (result.meta.status !== 200) return this.$message.error('删除权限失败')
      // this.getRolesList() 会关闭展开行
      // 通过引用传参动态刷新数据
      role.children = result.data
    },
    // 展示分配权限的对话框
    async showSetRightDialog (role) {
      this.roleId = role.id
      // 发起请求获取所有权限数据
      const { data: result } = await this.$http.get('rights/tree')
      if (result.meta.status !== 200) return this.$message.error('获取权限数据失败！')
      this.rightsList = result.data
      // console.log(this.rightsList);
      // 递归获取三级目录节点id
      this.getLeafKeys(role, this.defKeys);
      // console.log(this.defKeys);
      this.setRightDialogVisiable = true
    },
    // 通过递归的形式，获取角色下所有的三级权限的id，并保存到 defKeys 数组中
    getLeafKeys (node, arr) {
      // 如果当前节点不包含children属性，则是三级节点
      if (!node.children) return arr.push(node.id)
      // 否则递归子函数
      node.children.forEach(item => {
        this.getLeafKeys(item, arr)
      });
    },
    // 监听分配权限对话框的关闭
    setRightDialogClosed () {
      this.defKeys = [];
    },
    // 点击为角色分配权限
    async allotRights () {
      // getCheckedKeys获取全选id数组，getHalfCheckedKeys获半全选id数组
      // 通过ES6语法展开运算符展开数组类容合并为一个数组
      const keys = [
        ...this.$refs.treeRef.getCheckedKeys(),
        ...this.$refs.treeRef.getHalfCheckedKeys()
      ]
      // 将数组转换为字符串，以逗号给开
      const idStr = keys.join(',')
      // 发送设置的角色用户权限请求
      const { data: result } = await this.$http.post(`roles/${this.roleId}/rights`, { rids: idStr })
      if (result.meta.status !== 200) return this.$message.error('分配角色失败！')
      this.$message.success('分配权限成功');
      this.getRolesList();
      this.setRightDialogVisiable = false
    }
  }
}
</script>

<style lang='less' scoped>
.el-tag {
  margin: 7px;
}

.bdtop {
  border-top: 1px solid #eee;
}

.bdbottom {
  border-bottom: 1px solid #eee;
}

// 纵向居中对齐
.valign-center {
  display: flex;
  align-items: center;
}
</style>
